I think tonight was my first race with the new "pack dynamics" and I thought it was an improvement - looked and felt more realistic to me. Not massively different, just a bit better.
Overall, I think this months game release is really positive - small improvements to pack behaviours, delivery of a long standing feature (not having to quite to do multiple rides), a mechanism to better test and roll back feature updates, and a pretty long list of bug fixes in the release notes. Well done this month, Zwift
Reasonably happy with my race, too - set the pace up each of the little slopes but it didn't seem like anyone else was really interested in forcing a split though so didn't go too hard, and unfortunately ended up in a big group sprint at the end (my worst kind of finish).